package com.atguigu.champter7.state;

import com.atguigu.beans.WaterSensor;
import com.atguigu.utils.AtguiguUtil;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.api.common.state.ListStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

import java.time.Duration;
import java.util.Comparator;
import java.util.List;

public class Flink04_KeyedState_list {
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        conf.setInteger("reset.port", 9999);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(2);

        env
                .socketTextStream("hadoop104", 9999)
                .map(line -> {
                    String[] watersensors = line.split(",");
                    return new WaterSensor(watersensors[0], Long.valueOf(watersensors[1]), Integer.valueOf(watersensors[2]));
                })
                .assignTimestampsAndWatermarks(
                        WatermarkStrategy
                                //最大乱序程度
                                .<WaterSensor>forBoundedOutOfOrderness(Duration.ofSeconds(3))
                                //分配水印
                                .withTimestampAssigner((element, ts) -> element.getTs())

                                .withIdleness(Duration.ofSeconds(5))//如果有个并行度长时间[自定义时间]未获取数据,将另一个并行度的水印给没有数据的并行度
                )
                .keyBy(WaterSensor::getId)
                .process(new KeyedProcessFunction<String, WaterSensor, String>() {
                    private ListState<Integer> top3;

                    @Override
                    public void open(Configuration parameters) throws Exception {
                        top3 = getRuntimeContext().getListState(new ListStateDescriptor<Integer>("top3", Integer.class));
                    }

                    @Override
                    public void processElement(WaterSensor value,
                                               Context ctx,
                                               Collector<String> out) throws Exception {
                        top3.add(value.getVc());

                        List<Integer> list = AtguiguUtil.toList(top3.get());

                        list.sort(Comparator.reverseOrder());

                        if (list.size() > 3) {
                            list.remove(list.size() - 1);
                        }

                        top3.update(list);

                        out.collect( list.toString());

                    }
                })
                .print();
        try {
            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
